Bug 996507

Summary:	Update to 3.6-1 breaks backward compatibility
Product:	[Fedora] Fedora	Reporter:	Tom Atkinson <mail>
Component:	deltarpm	Assignee:	Jonathan Dieter <jonathan>
Status:	CLOSED CANTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	19	CC:	jonathan
Target Milestone:	---
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OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2015-01-12 12:55:09 UTC	Type:	Bug
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Tom Atkinson 2013-08-13 10:17:49 UTC

Description of problem:

After updating deltarpm to 3.6.1 previously created gzip deltarpms can no longer be applied.

Version-Release number of selected component (if applicable):

0:3.6-1.fc19

How reproducible:

Every time

Steps to Reproduce:
1. Install deltarpm 3.6
1. Build 2 gzip rpm packages.
2. Build deltarpm for them
3. Run applydeltarpm to verify.
4. Update deltarpm to 3.6.1
5. Run applydeltarpm again

Actual results:

md5 mismatch

Expected results:

Successful creation of deltarpm

Additional info:

There is no corresponding 3.6.1 update for rhel, so gzip deltarpms created there cannot be applied on Fedora.

Comment 1 Fedora End Of Life 2015-01-09 19:26:12 UTC

This message is a notice that Fedora 19 is now at end of life. Fedora 
has stopped maintaining and issuing updates for Fedora 19. It is 
Fedora's policy to close all bug reports from releases that are no 
longer maintained. Approximately 4 (four) weeks from now this bug will
be closed as EOL if it remains open with a Fedora 'version' of '19'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora 19 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events. Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

Comment 2 Jonathan Dieter 2015-01-12 12:55:09 UTC

Sorry for the delay in replying.  Just to be clear, we do not support applying deltarpms created with a different version of the compression library.

Deltarpm didn't change any code in its gzip using in the 3.6 update.  The problem is that gzip doesn't make any guarantees about byte-for-byte identical files which is what deltarpm requires.  When the gzip library changes, there is a non-zero chance that old deltarpms will no longer work, and there's not much we can do about that.

Comment 3 Tom Atkinson 2015-01-12 19:43:18 UTC

Thanks for taking the time to follow up on the EOL bugs.

I filed this originally because I suspected a change in deltarpm itself (probably https://gitorious.org/deltarpm/deltarpm/commit/e8f82b5d9014085d3cd63a5dc1332061e106b3c1) was the cause. Too late to do anything about it now anyway.